Ответ:
а) (2х-1)² = (2х)²-2*2х*1+1² = 4х²-4х+1
b) (2х+3у)² = (2х)²+2*2х*3у+(3у)² = 4х²+12ху+9у²
c) (-3а+4b)² = (-3а)² + 2*(-3a)*4b+ (4b)² = 9a²-24ab+16b²
d) (3a+2b)(2b-3a) = 3a*2b-3a*3a+2b*2b-2b*3a = 6ab-9a²+4b²-6ab = 4b²-9a²
a) х²+6х+9 = x²+2*3x+3² = (х+3)²
b) 4+4a+a² = 2²+ 2*2a+a² = (2+a)²
с) у²-100 = y²-10² = (y-10)(y+10)
d) 9-х⁴ = 3²- (x²)² = (3-x²)²
(a+b)² = a²+2ab+b²
(a-b)² = a²-2ab+b²
(a-b)(a+b) = a²- b²
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Answers & Comments
Ответ:
а) (2х-1)² = (2х)²-2*2х*1+1² = 4х²-4х+1
b) (2х+3у)² = (2х)²+2*2х*3у+(3у)² = 4х²+12ху+9у²
c) (-3а+4b)² = (-3а)² + 2*(-3a)*4b+ (4b)² = 9a²-24ab+16b²
d) (3a+2b)(2b-3a) = 3a*2b-3a*3a+2b*2b-2b*3a = 6ab-9a²+4b²-6ab = 4b²-9a²
a) х²+6х+9 = x²+2*3x+3² = (х+3)²
b) 4+4a+a² = 2²+ 2*2a+a² = (2+a)²
с) у²-100 = y²-10² = (y-10)(y+10)
d) 9-х⁴ = 3²- (x²)² = (3-x²)²
(a+b)² = a²+2ab+b²
(a-b)² = a²-2ab+b²
(a-b)(a+b) = a²- b²