Question

1. sederhanakanlah
3(2a+7)+5a-15
2.jika panjang lahan pak tani 8 m, sedangkan lebarnya (x+5)m dan luasnya 120m persegi.
tentukanlah nilai x tersebut....

Answer 1

1.) 3(2a+7)+5a-15 = 6a+21+5a-15
= 6a+5a+21-15
= a+6
2.) L = p x l
120 = 8 x (x+5)
120/8 = x+5
15-5 = x
x = 10

Answer 2

6 a + 21 + 5 a - 5
11 a + 16
2) 8 × x + 5 = 120
x+5 = 120/8
x+5 = 15
x = 15 - 5
x= 5