№1
a. (7x-3)(7x+3)=(7x)²-3²=49x²-9
b. (2x-8)²=(2x)²-2×2x×8+8²=4x²-32x+64
c. (7x-3)(7x+3)-(2x-8)²=49x²-9-(4x²-32x+64)=49x²-9-4x²+32x-64=45x²+32x-73
№2
a. (6x+5)²=(6x)²+2×6x×5+5²=36x²+60x+25
b. -4(6x+5)²=-4(36x²+60x+25)=-144x²-240x-100
Copyright © 2024 ELIBRARY.TIPS - All rights reserved.
Lista de comentários
№1
a. (7x-3)(7x+3)=(7x)²-3²=49x²-9
b. (2x-8)²=(2x)²-2×2x×8+8²=4x²-32x+64
c. (7x-3)(7x+3)-(2x-8)²=49x²-9-(4x²-32x+64)=49x²-9-4x²+32x-64=45x²+32x-73
№2
a. (6x+5)²=(6x)²+2×6x×5+5²=36x²+60x+25
b. -4(6x+5)²=-4(36x²+60x+25)=-144x²-240x-100