Hello :
<span>√(4x+13) = 2x-1......(1)
note : if ( a=b) so (a² = b²)
if : (</span>√(4x+13) )²= (2x-1)² so : 4x+13 = 4x²-4x+1
4x²-8x-12 = 0
x²-2x-3 = 0
(x+1)(x-3) = 0
x+1 = 0 or x-3=0
x= -1 or x=3
if : x= -1 : <span>√(4(-1)+13) = 2(-1)-1
</span>√9 =-3 but √9 =3
3 = -3 impossible ( -1 is not solution of equation (1)
if : x = 3 : √(4(3)+13) = 2(3)-1
5 = 5 ( right) conclusion : one solution : 3
(60(100-5)/100)(100+5)/100
60(95/100)(105/100)
60(.95)(1.05)
$59.85
Question4: C, question 5: A
It would have to be 5 60/100
(5 wholes and sixty out of a hundred)
Answer:
m = 4
Step-by-step explanation:
m−10+6m=10+2m
7m-10=10+2m
<em>Subtract 2m from both sides</em>
5m-10=10
<em>Add 10 to both sides</em>
5m=20
<em>Divide both sides by 5</em>
m=4