
formule de calcul
Authored by lili botez
Mathematics
7th - 8th Grade
Used 18+ times

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9 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
(a-3)(a+3)=
a2-9
a2-3
a-9
a2-6a+9
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
(x-5)(x+5)=
x2-5
x2-25
x2+25
x2-6x+25
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
(x+7)(x-7)=
x2+49
x2-7
x2-49
x2-14x+49
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
(x+2y)(x-2y)=
x2-4y+4y2
x-2y
x2-2y2
x2-4y2
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
(3x+5y)(3x-5y)=
9x2-4y+25y2
9x2-25y2
3x2-5y2
25x2-9y2
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
(x+√5)(x-√5)=
x2-5
x2-25
x2+5
x2-√5
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
(√7+√5)(√7-√5)=
√7-√5
2
√7+√5
12
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