Day 3: Solving Quadratics of the form x^2 + bx + c= 0

Solve the equation by factoring:
x² -6x + 8 = 0

• 2, 4
• -2, -4
• -2, 4
• 2, -4

Tags

CCSS.HSA-REI.B.4B

Solve the equation by factoring:

(k+5)(k+4) = 0

• {-4, 7}

• {4, -7/3}

• {-5, -4}

• {4, 5}

Tags

CCSS.HSA-REI.B.4B

Solve the equation by factoring:

(x+5)(3x - 1) = 0

• {4, 8}

• {-7/8, -1}

• {6, 5}

• {-5, 1/3}

Tags

CCSS.HSA-REI.B.4B

Solve the equation by factoring:

x²+6x = 0

• {-4, 4}

• {3, 2}

• {-6, 0}

• {-7, -3}

Solve the equation by factoring:

n²+11n +30 = 0

• {-6, -5}

• {6, 5}

• {2, 15}

• {-15, -2}

Tags

CCSS.HSA-REI.B.4B

Solve the equation by factoring:

x² +1x -6 = 0

• {-2, 3}

• {-2, -3}

• {2, -3}

• {-2}

Tags

CCSS.HSA-REI.B.4B

Solve the equation by factoring:

p² + 5p + 4 v= 0

• {-5, 0}

• {-4, -1}

• {-1, 4}

• {-4, 1}

When factoring quadratic trinomials of the form x² + bx + c, what is true about m and n if the factored form is (x + m)(x + n)?

• Their sum is equal to c, and their product is equal to b.
• The sum of b and c is equal to the product of m and n.
• Their sum is equal to b, and their product is equal to c.
• The product of b and c is equal to the sum of m and n.

Suppose the area of a square is x² – 10x + 25. What is the perimeter of the square? Hint: Factor the above first to find the side lengths.

• 2x – 10
• 4x
• 4x – 20
• 2x

Solve x² – x – 72 = 0.

• x = -8
• x = -8 or x = 9
• x = 8 or x = -9
• x = 9

Tags

CCSS.HSA-REI.B.4B