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Algebra

posted by on .

Can anyone please check the following for me please

Expand (5 - 2x) Squared

(5 - 2x) (5 - 2x)

5 sqrd + 5 X - 2x + -2x x 5 + -2x X -2x

so

5 Sqrd - 10x - 10x + 4X

= 5 sqrd + 4x

Am I right..thank you :-)

  • Algebra - ,

    No, you should use FOIL
    F - multiply the Firsts
    O - multiply the Outers
    I - multiply the Inners
    L - multiply the Lasts

    so (5 - 2x) (5 - 2x)
    = (5)(5) + (5)(-2x) + (-2x)(5) + (-2x)(-2x)
    = 25 - 20x + 4x^2

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