Simplify the expression: 2√ 20 − 3√ 7 − 2√ 5 + 4√ 63 . a. 2√ 20 − 3√ 7 − 2√ 5 + 4√ 63 b. 2√ 5 + 9√ 7 c. 2√ 20 − 4√ 7 − 2√ 5 d. 2√ 20 − 3√ 7 + 4√ 63

1) the property is   ixi = a ⇔x = a   o x = -a

4(x-5)+3= 15⇒4x-20+3 = 15⇒4x-17= 15⇒4x = 15+17⇒4x = 32⇒x =32/4= 8

4(x-5) +3= -15⇒4x-20 +3 = -15⇒4x-17= -15⇒4x =-15+17⇒4x = 2⇒x =2/4= 1/2

the values are x =8 and x = 0,5

the equation is going to be