EasyMathematicsHigh School (9–10)GeneralAlgebra › PolynomialsNumericalBoard Exam

Find the zero of each polynomial. 4x - 10; 7x + 21; 3 - 2x

Contributed by StemPy Lab

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

Find the zero of each polynomial.

$4x - 10$

$7x + 21$

$3 - 2x$

Need a reminder? The key ideaShow

A zero of $p(x)$ is a number $a$ with $p(a) = 0$ : the graph meets the x-axis there. A polynomial of degree $n$ has at most $n$ zeroes. The zero of $ax + b$ is $-\dfrac{b}{a}$ .

The worked solution

Have you tried it?

Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

← All Problems

← Find the value of p(x) = 3x² - x + 4 at x = 0, x = 2 and x = -3.Is 2 a zero of p(x) = x³ - 2x² - x + 2? Is -2 a zero? →

More onAlgebra › Polynomials

Discussion (0)

Loading…

Find the zero of each polynomial. 4x - 10; 7x + 21; 3 - 2x

The worked solution

Discussion (0)

Want to go further in Algebra › Polynomials?