Question

draw the graph of the polynomialx^2-2x-15.find its zeroes​ of the polynomial.

Answer 1

The zeroes of the polynomial are -3, 5.

• Let $y=x^{2}-2x-15$

              x:  -3    -2     -1        0        1       2     5

              y:    0    -7     -12     -15     -16    -15    0

• Plotting these points on graph paper.
• We get a parabola which cuts x-axis at two points (-3, 0) and (5, 0).
• The x coordinates are -3, 5.
• Therefore, the roots of the given polynomial are -3, 5.