Back to Exercise: Solve quadratic equations

Exercises: Solve Quadratic Equations in One Variable

Show all steps. Verify solutions by substituting back into the original equation where indicated.

Grade 9·20 problems·~40 min·Common Core Math - HS Algebra·standard·hsa-rei-b-4
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A

Recall / Warm-Up

1.

Which of the following is a solution to x2=25x^2 = 25?

2.

Which of the following correctly factors x25x+6x^2 - 5x + 6?

3.

A perfect square trinomial has the form x2+bx+cx^2 + bx + c. Which value of cc makes x2+10x+cx^2 + 10x + c a perfect square trinomial?

B

Fluency Practice

1.

Solve (x3)2=16(x - 3)^2 = 16. Show both solutions and verify each by substitution.

2.

Solve (x+5)2=9(x + 5)^2 = 9.

A six-row step table for completing the square, showing each algebraic step from the original equation to the solution.
3.

Solve x2+8x+5=0x^2 + 8x + 5 = 0 by completing the square. Show every step: moving the constant, adding (b/2)2(b/2)^2 to both sides, factoring, and solving.

4.

Solve x26x+2=0x^2 - 6x + 2 = 0 by completing the square.

5.

Solve 2x2+5x3=02x^2 + 5x - 3 = 0 using the quadratic formula. Identify aa, bb, and cc before substituting, and simplify fully.

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