Question

Proszę o zrobienie tych zadań z góry dzięki :)))

Answer 1

Wzory skróconego mnożenia:

(a+b)²=a²+2ab+b² - kwadrat sumy;

(a-b)²=a²-2ab+b² - kwadrat różnicy;

a²-b²=(a-b)(a+b) - różnica kwadratów;

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zad 5

(3-2x)(3+2x)-(2x-1)²=

=9-4x²-(4x²-4x+1)=

=9-4x²-4x²+4x+1=

=10+4x-8x²=

=2(5+2x-4x²)

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zad 6

(3x-4)²-2(2x+5)²-(x-8)(x+8)=

=9x²-24x+16-2(4x²+20x+25)-(x²-64)=

=9x²-24x+16-8x²-40x-50-x²+64=

=-64x+30=

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x=11/16

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=-64 * 11/16 +30=

=-44+30=

=-14

Answer 2

5.

9-4x^2-(4x^2-4x+1)=9-4x^2-4x^2+4x-1= -8x^2+4x+8

6.

9x^2-24x+16-2(4x^2+20x+25)-(x^2-64)=9x^2-24x+16-8x^2-40x-50-x^2+64=-64x+30

-64x+30= -64* 11/16+30= -44+30= -14