Question

twice the square of a number exceeds 4times they number by 30 find the number​

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Answer:

The number is 5 or -3

Step-by-step explanation:

Given,

Twice the square of a number exceeds 4 times the number by 30

To find

The number

Solution

Let the number be 'x'

Twice the square of a number = 2x²

Four times the number = 4x

Since Twice the square of a number exceeds 4 times the number by 30,

we have 2x² - 4x = 30

2x² - 4x - 30 = 0

x² - 2x - 15 = 0

(x-5)(x+3) = 0

x = 5, x=-3

∴ The number is 5 or -3

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