Answer:
40x²+2x-21
Step-by-step explanation:
4x × 10x - 4x × 7 + 3×10x - 3 × 7
40x² - 28x + 30x - 21
40x^2+2x-21
(4x + 3) (10x - 7)
Foil
first 4x*10x = 40x^2
outer 4x*-7 = -28x
inner 3*10x = 30x
last 3 *-7 = -21
Add them together
40x^2 -28x+30x-21
Combine like terms
