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English 24 Public

8 STD -IDENTITIES

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Expand (p+2)^2 = p^2+4p+4

TRUE

FALSE

(a^2 +b^2) - (a^2 - b^2) = a^2+4ab +b^2

true

false

Which is correct? (3a)^2 is equal to

9a^2

6a^2

3^2 a

3a^2

(p - 2)(p +1)(p - 4)= p^3 -5p^2+2p+8

FALSE

TRUE

(a–b)=3 and ab=5 then a^3 –b^3 = ____________

x^2+8x+15 =(x+3)(x+5)

TRUE

FALSE

7c^2 + 2c - 5 =(7c-5)(c+ 1)

TRUE

FALSE

The factors of x^2 –5x + 6 are (x–2)(x–p) then the value of p is

-3

One factor of x^3 +y^3 is

(x+y)^3

(x+y)

(x-y)^3

(x-y)

(x+4) and (x–5) are the factors of ___________

x^2-x-20

x^2-9x-20

x^2+9x+20

x^2+x-20

Square of a sum

Square of a difference

Difference of squares

Cube of a sum

Cube of a difference

Sum of cubes