Question

10 exemple pentru formula "(a+b)la a doua = a la a doua + 2ab + 2 la a doua"

Answer 1

(x + 3y)² = x² + 6xy + 9y²

(xy + 2y)² = x²y³ + 4xy² + 4y²

 (x + 6y)² = x² + 12xy + 36y²

(x + 9y)²=x² + 18xy + 81y²

(11x + 5y)²=121x² + 110xy + 25y²

(x + 2y)² = x² + 4xy + 4y²

(7x + 2y)² = 49x² + 28xy + 4y²

(8 + 9x)² = 64 + 144x + 81x²

(2x + 3y)² = 4x² + 12xy + 9y²

(5x + 2y)² = 25x² + 20y+4y²

exemplu cu rezolvare completa:

(3x +2 )²= 9x² + 12x + 4

9x² + 12x + 4

Δ=144-4×4×9
Δ=144-144=0
x₁=(-b+√Δ)/2a=(-12+0)/2 = - 6
x₂=(-b-√Δ)/2a=(-12-0)/2 = - 6