Question

Calculați: (y-1) la puterea a doua. (3-5b) la puterea a doua. (3x-7) la puterea a doua. (4x-3) la puterea a doua. Mulțumesc.

Answer 1

$(y-1)^2=y^2-2 \cdot y \cdot 1+1^2=y^2-2y+1 \\ (3-5b)^2=3^2-2 \cdot 3\cdot 5b+(5b)^2=9-30b+25b^2 \\ (3x-7)^2=(3x)^2-2 \cdot 3x \cdot 7+7^2=9x^2-42x+49 \\ (4x-3)^2=(4x)^2-2 \cdot 4x \cdot 3+3^2=16x^2-24x+9$