Free Practice Question

PS · Problem Solving

605-655

Algebra

How many real solutions does the equation $0.25x^4 - 0.75 x^2 -1 = 0$ have?

Answer Choices

Correct answer marked below

A

0

B

1

2

Correct

D

3

E

4

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What this question tests

What it tests

Your ability to manipulate linear and quadratic expressions, substitute unknowns, and solve equations under time pressure.

Common trap

Losing a sign when moving terms across the equals sign, or dividing both sides by a variable that could equal zero.

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How many real solutions does the equation 0.25x4−0.75x2−1=00.25x^4 - 0.75 x^2 -1 = 00.25x4−0.75x2−1=0 have?