Question

Question 8
Solve the quadratic equation, - x² + 3x + 10 = 0

Answer 1

Answer:

x=5

Step-by-step explanation:

$x ^{2} - 3x - 10 = 0 \\ \\ x ^{2} - 5x + 2x - 10 = 0 \\ \\ x(x - 5) + 2(x - 5) = 0 \\ x - 5 = 0 \: \: \: \: x = 5$

Answer 2

Answer:

$x = (- 3 + \sqrt{(3 ^{2}) - 4 \times - 1 \times 10 } ) \div( 2 \times - 1) = (- 3 + 7) \div ( - 2) = - 2 \\ \\ x = ( - 3 - 7) \div ( - 2) = 5$