Question

Simplifique as expressões
a) 7x²+2.(x²-1)
b) 10-4.(x-3)+5
c) -9.(2x-1)+15x
d)3a²-a.(2a-7)+1
e) 5.(1/5+x)-3x-10

Me ajudem por favor rs.

Answer 1

a) 7x² +2(x²-1) = 7x² + 2x² - 2 = 9x² - 2
b) 10 - 4(x-3) + 5 = 10 - 4x + 12 + 5 = -4x + 27
c) -9(2x - 1) + 15x = -18x + 9 + 15x = -3x + 9
d) 3a² - a(2a - 7) + 1 = 3a² - 2a² + 7a + 1 = a² + 7a + 1
e) 5(1/5 + x) - 3x - 10 = 5/5 + 5x - 3x - 10 = 2x - 9