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If 3x + 7 = x2 + M = 7x + 5, what is the value of 120% of M?
- A8.9
- B9.9
- C9.6
- DCannot be determined
Answer not set
Discussion 1
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CCommunity
We have,
3x + 7 = 7x + 5.
⇒ 4x = 2
⇒ x = 1/2 = 0.5
We also know,
3x + 7 = x2 + M
⇒ 3 × 0.5 + 7 – (0.5)2 = M
⇒ M = 1.5 + 7 - 0.25 = 8.25
120% of M will be = (120/100) × 8.25 = 9.9
3x + 7 = 7x + 5.
⇒ 4x = 2
⇒ x = 1/2 = 0.5
We also know,
3x + 7 = x2 + M
⇒ 3 × 0.5 + 7 – (0.5)2 = M
⇒ M = 1.5 + 7 - 0.25 = 8.25
120% of M will be = (120/100) × 8.25 = 9.9