Solution is

<form name="calculator" > <input type="button" value="1" onClick="document.calculator.ans.value+='1'"> <input type="button" value="2" onClick="document.calculator.ans.value+='2'"> <input type="button" value="3" onClick="document.calculator.ans.value+='3'">
<input type="button" value="4" onClick="document.calculator.ans.value+='4'"> <input type="button" value="5" onClick="document.calculator.ans.value+='5'"> <input type="button" value="6" onClick="document.calculator.ans.value+='6'"> <input type="button" value="7" onClick="document.calculator.ans.value+='7'">
<input type="button" value="8" onClick="document.calculator.ans.value+='8'"> <input type="button" value="9" onClick="document.calculator.ans.value+='9'"> <input type="button" value="-" onClick="document.calculator.ans.value+='-'"> <input type="button" value="+" onClick="document.calculator.ans.value+='+'">
<input type="button" value="*" onClick="document.calculator.ans.value+='*'"> <input type="button" value="/" onClick="document.calculator.ans.value+='/'"> <input type="button" value="0" onClick="document.calculator.ans.value+='0'"> <input type="reset" value="Reset"> <input type="button" value="=" onClick="document.calculator.ans.value=eval(document.calculator.ans.value)">
Solution is <input type="textfield" name="ans" value="">

(A + B )²

Is it possible to design a rectangular mango Grove whose length is twice it's breadth, and the area is 800m²? If so, find it's length and breadth

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Prove that root 8 is an irration number

Venu Gopal has twice

sin60° cos 30°+ cos60° sin 30°

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X-y=5

If 1/2 is a root of equation x^2+kx- 5/4 =0 , then what is the value of k

Find the nature of quadratic equation x^2 +x -5 =0