Share

# Solve the Following Equation Using the Formula X^2 + 10x + 21 = 0 - ICSE Class 10 - Mathematics

ConceptSolutions of Quadratic Equations by Factorization

#### Question

Solve the following equation using the formula

x^2 + 10x + 21 = 0

#### Solution

x^2 + 10x + 21 = 0

Here a = 1, b = -10 and c = 21

Then x = (-b +- sqrt(b^2 - 4ac))/(2(1))

= (-(-10) +- sqrt((-10)^2 - 4(1)(21)))/(2(1))

= (10 + - 4)/2 = (10 +  4)/2 and (10 - 4)/2 = 7 and 3

Is there an error in this question or solution?

#### APPEARS IN

Solution Solve the Following Equation Using the Formula X^2 + 10x + 21 = 0 Concept: Solutions of Quadratic Equations by Factorization.
S