Write √80 in the form c√5, where c is a positive integer.
Firstly, we recall that √ab=√a x √b. Noticing that 80=16 x 5 then, we have that √80=√16 x √5. Since √16 = 4 then, we have that √80=4 x √5. So, giving the final answer in the form that the question asks: c=4, which is a positive integer (positive means greater than zero, integer means whole number, i.e. not a fraction or decimal).
TD
Related Maths A Level answers
All answers ▸When solving a trigonometric equation, like sin(x) = -1/3 for 0 ≤ x < 2π, why do I get an answer outside the range? Why are there many correct answers for the value of x?
Find the values of y such that log2(11y-3)-log2(3)-2log2(y) = 1
Integration by parts; ∫e^x sin(x) dx
The curve C has equation x^2 + 2xy + 3y^2 = 4. Find dy/dx.