Question

solve the following by factorisation method
-x²+8x+20=0​

Answer 1

Answer:

plsrefer to the attachment

Answer 2

Answer:

The value of "x" is 10 or -2.

Step-by-step explanation:

$- (x {}^{2} - 8x - 20) = 0 \\ x {}^{2} - 8x - 20 = 0 \\ x {}^{2} - (10x - 2x) - 20 =0 \\ x {}^{2} - 10x + 2x - 20 = 0 \\ x(x - 10) + 2(x - 10) = 0 \\ (x - 10) (x + 2) = 0 \\ even \\ x - 10 = 0 \\ x = 10 \\ nor \\ x + 2 = 0 \\ x = - 2$

In the third line, I do middle term then I divide the number 20 in -10 & 2