Answer:
7.6 should be the answer.
(x-3) (x+5) => x*x+5x-3x-15
=> x*x+2x-15
Step-by-step explanation:
x3 + 2x2 - 4x - 8 = 3x-8
all is easy first do it in the bracketsand do it divied multiply add and substrate
1/2(bh)
A=20
