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The problems you missed are listed below with answers and explanations.  Look over the explanation for each problem so you can understand why you missed it!

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'); resetdisplay(); for(var i = 0; i <10; i++) { ganswer[i] = prompt(question[i],""); if (ganswer[i] == "quit" || ganswer[i] == "QUIT" || ganswer[i] == "Quit") { break; } q++; if (ganswer[i] == answer[i]) { c++; } else { rightans[i] = 0; w++; } resetdisplay(); } for(var i = 0; i < 10; i++) { if (rightans[i] == 0) { expl = expl + explain[i]; } } parent.frames[0].document.write(expl); parent.frames[0].document.write("
"); } question[0] = 'x^2 + 4x + 4'; question[1] = 'x^2 + 6x + 9'; question[2] = '4x^2 + 8x + 4'; question[3] = '2x^2 + 3x + 1'; question[4] = 'x^2 + x - 2'; question[5] = 'x^2 + 7x + 12'; question[6] = '4x^2 + 8x + 3'; question[7] = '2x^2 + 3x + 1'; question[8] = 'x^2 + 4x + 3'; question[9] = '4x^2 + 5x + 1'; answer[0] = '(x+2)(x+2)'; answer[1] = '(x+3)(x+3)'; answer[2] = '(2x+2)(2x+2)'; answer[3] = '(2x+1)(x+1)'; answer[4] = '(x+2)(x-1)'; answer[5] = '(x+4)(x+3)'; answer[6] = '(2x+3)(2x+1)'; answer[7] = '(2x+1)(x+1)'; answer[8] = '(x+3)(x+1)'; answer[9] = '(4x+1)(x+1)'; explain[0] = '#1

x^2 + 4x + 4

Factor.

(x+2)(x+2)

'; explain[1] = '#2

x^2 + 6x + 9

Factor.

(x+3)(x+3)

'; explain[2] = '#3

4x^2 + 8x + 4

Factor.

(2x+2)(2x+2)

'; explain[3] = '#4

2x^2 + 3x + 1

Factor.

(2x+1)(x+1)

'; explain[4] = '#5

x^2 + x - 2

Factor.

(x+2)(x-1)

'; explain[5] = '#6

x^2 + 7x +12

Factor.

(x+4)(x+3)

'; explain[6] = '#7

4x^2 + 8x + 3

Factor.

(2x+3)(2x+1)

'; explain[7] = '#8

2x^2 + 3x + 1

Factor.

(2x+1)(x+1)

'; explain[8] = '#9

x^2 + 4x + 3

Factor.

(x+3)(x+1)

'; explain[9] = '#10

4x^2 + 5x + 1

Factor.

(4x+1)(x+1)

'; rightans[0] = 1; rightans[1] = 1; rightans[2] = 1; rightans[3] = 1; rightans[4] = 1; rightans[5] = 1; rightans[6] = 1; rightans[7] = 1; rightans[8] = 1; rightans[9] = 1; //-->