anonymous
  • anonymous
Solve by Factoring: 2a^2-a-21=0
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
@wolf1728
anonymous
  • anonymous
Doing the AC method, you take A times C, so 2 times -21 which equals -42. so what two numbers multiply to get -42 and add to get -1. 6 and -7 multiply to get -42 and add to get -1 so you use those two number to set up your equation. y=(x+6)(x-7) then set each part equation to 0. 0=x+6=-6 0=x-7=7 So the answer: x=-6 and x=7
wolf1728
  • wolf1728
2a^2-a-21=0 Divide by 2 a² -.5a -10.5 factors of -10.5 = 7 * 1.5 3 * 3.5 we need a negative third term and a negative second term so we change signs accordingly until we get: (a + 3) • (a-3.5)

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anonymous
  • anonymous
thanks... Do you know what What times what= 6 and add up to -2.5?
wolf1728
  • wolf1728
Hmm where are those numbers in the factoring?
wolf1728
  • wolf1728
Anyway -4 * -1.5 = 6 But do not add to -2.5 -4 * 1.5 = -6 and -4 + 1.5 = -2.5 Are you sure about the signs in that question?

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