EduFarming
Your list · 0हिं

Type at least two letters. Press Esc to close.

↑↓ navigate↵ openTAB cycle filter

Simplification & Approximation · Question 44 of 71

Question 44

EasyOriginal question

Evaluate (50+4−1)×8(5^0 + 4^{-1}) \times 8.

Options for question 44

Show the answer and explanation
CorrectNot quiteAnswer A

Correct answer: A

Explanation

  1. Any non-zero number to the power 0 is 1, so 50=15^0 = 1.

  2. A negative power is a reciprocal: 4−1=144^{-1} = \frac{1}{4}.

  3. (1+14)×8=54×8=10\left(1 + \frac{1}{4}\right) \times 8 = \frac{5}{4} \times 8 = 10.

Worth noting

Reading 4−14^{-1} as 4 gives (1+4)×8=40(1 + 4) \times 8 = 40; reading 505^0 as 5 gives 42.

Concept
Zero and negative indices
Typical time
35 s
Your time
—
The rule this testsPowers, roots and surds
Practise this chapter →

Ten questions from Simplification & Approximation, at your own pace.

Practise this chapter →

Ten questions from Simplification & Approximation, at your own pace.