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Q: What is the answer for this quadratic equation 2x2 - 3x - 90?

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x is 30 to work it out- 3x 30=90 90-2=88

This is a simultaneous equation question. 4(3x+4y = 90) 3(4x-3y = -5) Multiply the top equation by 4 and the bottom equation by 3 then subtract the bottom equation from the top equation remembering that in maths a minus from a minus is equal to a plus. 12x+16y = 360 12x-9y = -15 And when subtracted: 0+25y = 375 Divide both sides of the equation by 25 to find the value of y: y = 15 Substitute 15 for y into the original equation to find the value of x: Solution: x = 10 and y = 15

2x-10+3x-10=90 5x-20=90 5x=110 x=22

x + (x+1) + (x + 2) = 267 3x + 3 = 267 3x = 264 x = 88 Answer: 88, 89, 90

in quadratic equation it must be in standard form, ax^2 + bx + c = 0. Jenny is five years older than Marian. In three years, the product of her age and Marian's age five years ago will be 90 years. Find their present age. Solution: Let x= Marian's present age x + 5= Jenny's present age The working

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Let the number of sides be x and use the diagonal formula:- If: 0.5*(x^2 -3x) = 90 then x^2 -3x = 90*2 If: x^2 -3x = 180 then x^2 -3x -180 = 0 Using the quadratic equation formula gives a positive value of 15 for x Therefore perimeter of the polygon: 15*4 = 60 cm

If: n squared -n -90 = 0 Then the solutions are: n = 10 or n = -9

Any line with the equation of the form 3y = -x + c where c is any constant.

A quadratic equation, if there's an equals stil to come... Otherwise it's just an expression.

90 Lb.

X + X/2 = 45 so 3X/2 =45 3X=90 X=30

3x + 9 y = 120 5x + 5y = 90 multiply first equation by 5 ( both sides) multiply second equation by 3 ( both sides) 15 x + 45 y = 600 15 x + 15 y = 270 subtract 30y = 330 divide by 30 y = 11 substiute y into first equation 3 x + 9 y = 120 3x + 99 = 120 3x = 21 x = 7

If 2x2 + 10 = 100 then: 2x2 = 100 -10 2x2 = 90 x2 = 90/2 x2 = 45 x = 6.708 (to 3 decimal places only)

2x-10+3x-10 = 90 degrees and the value of x works out as 22 degrees

3x2-39x-90 = (3x+6)(x-15) when factored

117

6x + 5 = 95 - 3x The main goal is to get "x" by itself. So you can first subtract 5 from both sides because whatever you do on one side of the equation, you do to the other side. 6x = 90 - 3x Next add 3x on both sides. 9x = 90 Last divide by 9 on both sides. x = 10

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