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OpenStudy (ineedhelpnow):
i need help solving (2x+5y)^2 here's my work: (2x)^2+2(2x)(5y)+(5y)^2 4x^2+20xy+25y^2
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OpenStudy (amistre64):
looks good
OpenStudy (anonymous):
which equation represents a line through (-2,1) that is perpendicular to y=-5x+2?
OpenStudy (ineedhelpnow):
i'm just multiplying polynomials in two variables... my book is telling me that the answer is 4x^2+12xy+9y^2. i have no idea how they got that.
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