Question

ПОМОГИТЕ ПОЖАЛУЙСТА УМОЛЯЮ

Answer 1

Объяснение:

1) а) (х+4)^2 = х^2+8х+16

б) (3b-c)^2 = 9b^2-6bc+c^2

в) (2у+5)(2у-5) = 4у^2-25

г) (у^2-х)(у^2+х) = у^4-х^2

2) а) 1/9-а^2 = (1/3-а)(1/3+а)

б) b^2+10b+25 = (b+5)^2 = (b+5)(b+5)

3) а = -(2/3)

(а-2b)^2+4b(a-b) = a^2-4ab+4b^2+4ab-4b^2 = a^2 = (-2/3)^2 = 4/9

4) а) 3(1+2ху)(1-2ху) = 3(1-4х^2у^2) = 3-12х^2у^2

б) (х^2-у^3)^2 = х^4-2х^2у^3+у^6

в) (а+b)^2-(a-b)^2 = a^2+2ab+b^2-a^2+2ab-b^2 = 4ab

5) а) (4х-3)(4х+3)-(4х-1)^2 = 3х

16х^2-9-16х^2+8х-1 = 3х

5х = 10

х = 2

б) 16с^2-49 = 0

16с^2 = 49

с^2 = 49/16

с = 7/4; -7/4