Doprowadź wyrażenie do najprostszej postaci.
( 4+3x)do kwadratu + 5(x+3)(x-3)=
3(x-1)do kwadratu - (4x+6)(4x-6)-(4x+5)do kwadratu=
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Korzystamy ze wzorów skroconego mnozenia:
(a+b)^2 = a^2 + 2ab + b^2
(a-b)^2 = a^2 - 2ab + b^2
(a+b)(a-b) = a^2 - b^2
(4+3x)^2 + 5(x+3)(x-3) = 4^2 + 2*4*3x +(3x)^2 + 5(x^2 -3^2) =
= 16 +24x + 9x^2 + 5x^2 - 45 = 14x^2 + 24x - 29
3(x-1)^2 -(4x+6)(4x-6) -(4x+5)^2 = 3(x^2 -2x +1)-(16x^2 -36) -(16x^2 + 40x + 25) =
= 3x^2 - 6x + 3 -16x^2 + 36 -16x^2 - 40x -25 = 29x^2 - 46x + 14