Ask a New Question

Question

Solve for "x" using the quadratic formula:

X^2-4x-21=0
13 years ago

Answers

Steve
x = [4 ± √(16 - 4(1)(-21)]/2
= [4 ± √(16 + 84]/2
= [4 ± √100]/2
= (4 ± 10)/2
= 7,-3
13 years ago

Related Questions

x'2+ 10= 3x+17. Use the quadratic formula to solve. -x squared -2x +4 solve quadratic equation by factoring Solve this by using the Quadratic Formula 6x^2 - 7x = - 4 Let f(x)=ax^2+bx+c be a quadratic function where a≠0 . Which of the following statements is true ab... x^2-6x-20=20 Solve for Quadratic Equation - 35x2 = 40x Solve the quadratic equation by factoring. Write your answer in reduced fraction form,... Which of the following quadratic expressions is factorable over the integers? Select all that appl... What are the linear and quadratic factors of the expression 3x4+7x3+4x2 ?(1 point) Responses (3x+4)(... Ite Solve the following quadratic equation using square rootsRound to the nearest hundredth if neces... Which of the following quadratic equations is not solvable by grouping? Desmos Calculator (click...
Ask a New Question
Archives Contact Us Privacy Policy Terms of Use