Find the zeroes of the quadratic polynomial x^2 + 8x + 15.
x2+8x+15 = (x+3)(x+5)So, the value of x2+8x+15 is zero when x2+8x+15 = 0 i.e. x = -3 or x = -5.
PS
Related Maths GCSE answers
All answers ▸Show that 6sin(60◦) + 5tan(60◦) can be written in the form √k where k is an integer.
Complete the square for the quadratic expression x^2 − 8x + 7
Emma wants to buy a radio, the full price is £80. In the shop, she is given a discount. A year later, she sells the radio for £78, giving her a profit of 30% of what she bought it for the year before. What discount did she receive? (4)
Solve the inequality 3x+7>x-3