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A day full of math games & activities. Find one near you.

A day full of math games & activities. Find one near you.

A day full of math games & activities. Find one near you.

# If f(x) = x² - 2x and g(x) = 6x + 4, for which value of x does (f + g)(x) = 0?

-4, -2, 2, 4

**Solution:**

Given are two functions f(x) and g(x).

To find: (f + g)(x) = 0

We know that f(x) + g(x) = (f + g)(x)

**Step 1: **Solve f(x) + g(x)

∴ (f + g) (x) = (x² - 2x) + (6x + 4)

⇒ x² + 4x + 4 = 0

**Step 2: **Find the solutions of the equation (f + g) (x) = 0.

x² + 4x + 4 = 0

In the above equation, a = 1, b = 4 and c = 4

**Step 3: **Split the middle term.

⇒ x² + 2x + 2x + 4 = 0

⇒x(x + 2) + 2 (x + 2) = 0

⇒ (x + 2)(x + 2) = 0

**Step 4: **Equate both the factors to 0.

x = -2

## If f(x) = x² - 2x and g(x) = 6x + 4, for which value of x does (f + g)(x) = 0?

**Summary:**

The value of x = - 2 with the multiplicity of 2 as it occurs twice as the factors, at (f + g)(x) = 0

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