Question

simplifique as expressões: a)7x²+2(x²-1)= b)10-4(x-3)+5= c)-9(2x-1)+15x= d)0,25(4x-100)+7x= e)3a²-a(2a-7)+1= f)5(1+x)-3x-10 ( (5)

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 =  3 (- x + 3)

d)
0,25 (4x - 100) + 7x
1x - 25 + 7x = 8x - 25

e)
3a² - a (2a - 7) + 1
3a² - 2a² + 7a + 1
a² + 7a + 1

f) 5 (1 + x) - 3x - 10
5 + 5x - 3x - 10
2x - 5