Question

X²- 9x + 20=0 it´s finding solutions for x

Answer 1

Explanation:

Sum = -9

Product = 20

Factors = -5 , -4 {-4 * -5 = 20 & -5 + (-4) = -9}

x² - 9x + 20 = 0

x² - 5x - 4x + 20 = 0 Rewrite middle term

(x² - 5x) - 4x + 20 = 0 Group terms

x(x - 5) - 4(x - 5) = 0 Factor terms

(x-5)(x -4)=0

x -5 = 0 ; x - 4 = 0

x = 5 ; x = 4

Ans: x = 5 , 4