Question

Bagaimana cara penyelesaiannya :
1) X + = 7
2) =
3) + = 3

TOLONG DIBANTU JAWABNYA YA.
BESOK SUDAH DIKUMPUL NIH :(

Answer 1

Kuadratkan kedua ruasnya
1) √(x+5) = 7 - x
[√(x+5) ]² = (7-x)²
x+ 5 = 49 - 14x + x²
x^2 - 15x + 44 = 0
(x - 11)( x - 4) = 0
x = 11 atau x = 4

2) {√(2x-3)]² = {√(x-1)}²
2x - 3 = x- 1
x = 2

3) {√x + √(x+1)}²  = 9
x + x+ 1 + 2√(x²+1) = 9
2√(x²+1) = 8 - 2x
√(x²+1) = 4 - x
{√(x²+1)}² = (4-x)²
x² + 1= 16 - 8x + x²
8x = 16 -1
x = 15/8