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[s + t]²

• S² + t² + 2s²t²

• 2st + s² x t²

• 2st + t² + s²

• S² + t^{2 _} 2st

k² - l²

• ( k- l)(k - l)

• (k - l)( k + l)

• (-k + l)(l - k)

• (-l + k)(k + l)

(z - y)²

• z² - y² + 2xy

• z² + y² - 2 x z²y

• - 2zy + y² + z²

• -2zy x y² + z²

( l + m)²

• l² + m² + 4ml

• l² + m² + 4lm

• 2lm + m² + m²

• l² + m² +2 x lm

( x + y )²

• x³ + y³ + 3xy ( x + y)

• 3x²y + 3y²x + x³ + y³

• x^{3 _} 3x²y + 3y²x - y³

• x³ + y³ - 3(x+y)

• none of the above

state true or false :

( p - q)² and ( q - p)² are same.

hint : there is (—)sign not (+) sign .be careful

• True

• False

(m + n)² can be expressed as 

• m + n²
• 2 (m + n)
• m² + n²
• (m + n) (m + n)

Which of the following is true?

• (a-b)² = a² - b²
• (a + b)² = a² + 2ab + b²
• (a - b)² = a² - 2ab - b²
• (a + b) (a - b) = a² - 2ab + b²