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Factoring
100

x^2+2x+1

What is (x+1)(x+1)

200

x^2+16x+15

What is (x+1)(x+15)

300

x^2-16x+64

What is (x-8)(x-8)

400

x^2+20x+75

What is (x+15)(x+5)

500

x^2+5x-66

What is (x+11)(x-6)