Best Answer

The Quadratic Formula gives the value of x in equations of the form ax2 + bx + c.

In this instance a = 4, b = 11 and c = -21.

((-b +/-(sqrt(b2 - 4ac))/2a

= (-11 +/- sqrt (121 + 336))/ 8

= (-11 +/- 21.4)/8

x = 1.3 or 4.05

Q: How do you solve 4x squared minus 21 equals negative 11x?

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Solve using the quadratic formula

If x squared -10 = 0 then x = the square root of 10

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x = 25 / 3squared + 5

Related questions

Solve this problem -x squared -40x- 80 =0

Solve using the quadratic formula

X=1

If x squared -10 = 0 then x = the square root of 10

First you must square the 6 which the answer is 36. Then you subtract 36 from 8 and the answer is negative 28. Finally you solve negative 28 minus 28 (-28-28) which equals negative 56 (-56).

You have to put your heart into it!

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hello

x = 25 / 3squared + 5

Without an "equals" word or sign somewhere, there is nothing to solve.You only have an expression, not an equation.

-5x2 = -75 x2 = 25 x = ±sqrt( 25 ) x = ±___

That factors to (x + 1)(x - 3) x = -1, 3