document.write( "Question 1189918: The graph of a certain quadratic y = ax^2 + bx + c is a parabola with vertex (-4,0) which passes through the point (1,-75). What is the value of a? \n" ); document.write( "
Algebra.Com's Answer #821529 by MathTherapy(10552)\"\" \"About 
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\n" ); document.write( "The graph of a certain quadratic y = ax^2 + bx + c is a parabola with vertex (-4,0) which passes through the point (1,-75). What is the value of a?
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That's ABSOLUTELY unnecessary to complete the square and go through all that \"mumbo-jumbo\" as the other person did.\r\n" );
document.write( "This is done as easily as: Vertex form of the equation \r\n" );
document.write( "                            of a parabola: \"matrix%281%2C3%2C+y%2C+%22=%22%2C+a%28x+-+h%29%5E2+%2B+k%29\"\r\n" );
document.write( "                                        \"matrix%281%2C3%2C+-+75%2C+%22=%22%2C+a%281+-+-+4%29%5E2+%2B+0%29\" ------ Substituting (1, - 75) for (x, y) and (- 4, 0) for (h, k)\r\n" );
document.write( "                                         - 75 = 25a\r\n" );
document.write( "                                       \r\n" );
document.write( "                                       That's ALL!!
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