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(2x-1)*(3x+5)=5
Use foil's method. First Outside Inside Last for multiplying
the equation turns out to this
(2x*3x)+(2x*5)+-(1*3x)+-(1*6)=5
Solve within the parentheses.
6x2+ 10x+-3x+-6=5
Continue to solve
6x2+7x+-6=5
You need to make =5 to =0
6x2+7x+-6+-5=5-5
6x2+7x+-11=0
quadratic formula is x=[-b +- {b^2*(-4ac)^2}]/2a
there are two equations to solve. the number and the opposite of a number
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2x1 plus 3x2 plus 7x3 equals 12?
No. 7*3, alone, is bigger than 12.
What times what equals 2?
it wouldn't equal anything its a prime number but of course it would be only 2x1
2 times 2 equals what?
It is: 1*2 = 2 which is also a prime number
4x-7y equals 13 -2x plus 7y equals -3?
One way to solve this system of equations is by using matrices. Form an augmented matrix in which the first 2x2 matrix is the coefficient matrix and the 2x1 matrix on its right is the answer. Now apply Gaussian Elimination and back-substitution. Using this method gives x=5 and y=1.
What decimal is represented by this expanded form 3x1000 plus 6x100 plus 1x10 plus 2x110 plus 1x11000?
3x1000 + 6x100 + 1x10 + 2x1/10 + 1x1/1000 = 3000 + 600 + 10 + 0.2 + 0.001 = 3610.201
