Question

Calcule:
a) (5x - 1) . (5x + 1)
b)(a + b)(a + b)
c) (2x2 – 3x – 6)· (5x – 2).​

Answer 1

$a)(5x) {}^{2} - 1 {}^{2} \\ 25x {}^{2} - 1$

$b)(a + b) {}^{1} \times (a + b) {}^{1} \\ (a + b) {}^{1 + 1} \\ (a + b) {}^{2}$