If f(x) = 3x +x^2, what is f(-2)?
f(-2) = 3(-2) + (-2)2 = -6 + 4 = 2First you need to substitute -2 for each value of x in the function. Then you need to simplify the expression by multiplying -2 by 3 and by squaring -2. (Hint: negative numbers squared are always positive). Finally just add the two numbers.
WB
Related Maths GCSE answers
All answers ▸A graph is given with a plot of y = sin(x) for 0 <= x <= 360. Which value of x in the range 90 <= x <= 180 satisfies sin(x) = sin(30)?
Factorise 3x^3y^2-6x^2y+9xy
solve; (6x - 2)/2 - (4x+7)/3 = 1-x
When I multiple two negative numbers together is my answer positive or negative?