Answer:
x = 8.481 or -4.481
Step-by-step explanation:
x^2 - 4x - 9 = 29
x^2 - 4x - 9 - 29 = 0
x^2 - 4x - 38 = 0
x1
= −(−4) − √ (−4)2 − 4×1×(−38)
2×1
= 4 − 2 × √ 42
2
≈ −4.481
x2
= −(−4) + √ (−4)2 − 4×1×(−38)
2×1
= 4 + 2 × √ 42
2
≈ 8.481
x = 8.481 or -4.481
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