please teach me to do this problem step by step
(x+8) (x-10)
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(x+8)(x-10)
step 2
x(x-10) + 8(x-10)
step 3
(x² -10x) + (8x -80)
step 4
x² - 10x +8x - 80
step 5
x²-2x-80
Another way is by simply using the identity...
(x+a)(x+b)=x²+(a+b)x+ab
⇒(x+8)(x-10)
⇒x²+(8-10)x +(8)(-10)
⇒x²-2x-80