Question

cel de mai suss
revolcare completă
va roogg
dau coroanaaa

Answer 1

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Answer 2

a) (1+a)² + (2+a) ²+(3+a) ²= 1²+2×1×a+ a²+2²+2×2 ×a+a²+3²+2×3×a+a³= 1+2a+a²+4+ 4a+a²+9+6a+a²= 14+12a +3a²
b) (x-2y) ²+(x-2y) ×(x+2y) = x²-2×2y + (2y) ² + x²-(2y) ²= x²-4y +4y²+x²-4y²= 2x²-4y
c) (3x-2)²+5x(x-3)= (3x) ²-2×3x×2 + 2²+ 5x²-15 x= 9 x²-12x +4+5x²-15x = 14 x²-27x+4
d) (3x+y) ²+(x-y) (x-y) = (3x) ²+2×3×x×y +y² (x-y) ²= 9 x²+6xy+y²+ x²- 2×x×y +y²= 10x²+ 4xy +2y²
e)(1-3y) ²+(1+3y) ²-18y²= 1²-2×3×y +(3y) ²+1²+2×3×y+(3y) ²-18y²= 1-6y+9y²+1+6y+9y²-18y²= 2+0=2
f) (a²+b) ²+(a²-b) ² = (a²) ²+2a²×b+ b²+ (a²)²-2×a²×b+ b²= a⁴+2a²b +b²+ a⁴- 2a²b+b²= 2a⁴+2b²