(2r-5)(R-5), (X+4)(X+4), 3(X\Xb2+7), (2t-1)(T+5)

(2r-5)(r-5)
(X+4)(x+4)
3(x²+7)
(2t-1)(t+5)

 

1) (2r - 5)(r - 5)

2r² - 5r - 10r + 25

2r² - 15r + 25

2) (x+4)(x+4)

x² + 4x + 4x + 16

x² + 8x + 16

3) 3(x²+7)

3x² + 21

4) (2t-1)(t+5)

2t² - t + 10t - 5

2t² + 9t - 5

Welcome! ;)